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Special report, according to IHS iSuppli magnetic sensors, to improve vehicle safety, convenience and fuel efficiency, silicon magnetic sensors in the car motor will be rapid growth in sales in the market growth of nearly 40 percent in 2012.

    2012 car motor areas of the magnetic sensor sales will reach $ 160.3 million, surged 38.2 percent from $ 116 million this year, continuing the solid growth momentum in the last three years. 2012 sales growth rate will slow to single digits, but a 2010-2015 compound annual growth rate will reach 16%. 2015, sales of automobile motor field of magnetic sensors will rise to $ 193.6 million, as shown in Figure 1.

    Magnetic sensors are widely used in industrial automation processes in a variety of motor applications in the automotive industry is particularly prevalent, accounting for 50% of market value. For example, the middle and low car more than 10 kinds of motors, such as fan cooling, alternator and windshield wipers. The luxury sedan has nearly 100 motors, including the blower used for air conditioning, electronic steering and throttle control sensor and transmission sensor for automation with the new dual-clutch system; as well as for the seat position adjustment, sunroof, tachometer, and headlight position adjustment, the cushion of the sensor, even for air quality information to control the intake throttle.

    Encourage people to improve the motor efficiency is an important factor in energy consumption, save every drop of fuel are critical, generated per gram of carbon dioxide exhaust gas to be taken into account. The trend in this area is a belt driven motor electrification, and replacing it with a brushless DC motor. Efficient motor allow demand to operate the main power transmission components, such as water cooling pump, pump and other auxiliary pump, and can reduce overall energy demand.

    Another application of the magnetic sensor in the motor shaft position encoder - For example, among the power windows, the sensor can determine the axis of rotation the number of laps to control the stroke of the window lifter. The sensors can also detect the manpower caused by the abnormal load conditions, the so-called "anti-trap feature, hit an object, the motor can be reversed.

The electric power steering is a fast-growing DC motor applications used in place of the electro-hydraulic system, the latter using a pump to generate pressure to improve fuel efficiency. Sensors for motor commutation and probe current.

In hybrid electric vehicle, the magnetic sensors used to monitor auxiliary motor inverter. The inverter used to convert the battery DC motor AC. This conversion requires the use of three current sensors for each phase of the motor requires a.

Advanced automotive applications need to use the Hall IC and AMR sensors

    Typically, motor vehicle use the Hall IC, in the three-phase motor for commutation. Three-phase motor usually has a six state, three digital Hall IC measurement in order to achieve closed-loop adjustment. In some cases, may not need the magnetic sensor, the Hall IC may be a simple circuit current measurement method to replace. For example, the DC motor of constant speed and load changes in environment (such as transport at constant speed fan), without the use of sensors will be able to infer the required speed.

    However, for advanced motor load changes and torque information need to understand the need to use the Hall IC and the Anisotropic Magnetoresistive (AMR) sensors for measuring the location of the motor shaft.

    In particular, the AMR usage will increase over the next five years, the largest applications will be the tachometer motor speed and speed meter, it allows the motor to become quiet.

    He Lanen, NXP Semiconductors is a leading provider of AMR sensors, Switzerland, the Micronas, Infineon, Germany, Allegro Microsystems, USA, Belgium, of Melexis' NV and Asahi Kasei Microsystems, supply the Hall sensor IC.

ZheJiang DongYang Strong Electron Co., Ltd